On regular Frechet-Lie groups. III: A second cohomology class related to the Lie algebra of pseudo-differential operators of order one
Fourier-integral operators on a closed Riemannian manifold
tangent space on a neighborhood of the identity operator in the space of Fourier- integral operators of order 0
space of all pseudo-differential operators of order one with real principal symbols
second cohomology group of the Lie algebra of all contact vector fields on the unit cosphere
scientific article; zbMATH DE number 3764785